Webster dictionary was developed by Noah Webster in the beginning of 19th century. On this website, you can find definition for underground from the 1913 edition of Webster's Revised Unabridged Dictionary. Define underground using one of the most comprehensive free online dictionaries on the web.

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underground
Part of Speech: Noun
Results: 4
1. Being below the surface of the ground; as, an underground story or apartment.
Part of Speech: noun
1. The place or space beneath the surface of the ground; subterranean space.
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